Adaptive zero voltage switching for near field communication
AssigneeRenesas Electronics America Inc.
InventorMarco Sautto
Life of this patent
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Abstract
Systems and methods for operating a wireless power transfer device are described. A circuit can generate a first signal that indicates a voltage at a node between a first high-side (HS) transistor and a first low-side (LS) transistor in a switching converter falling below ground. The circuit can delay a gate-source voltage of a second LS transistor in the switching converter to generate a second signal. The circuit can merge the first signal and the second signal to generate a third signal. A controller can use the third signal to trigger a rising edge of a command signal to turn on the first LS transistor at a specific time. The first LS transistor being turned on at the specific time reduces a diode conduction time of a body diode of the first LS transistor.
Claims20
A semiconductor device comprising:
- a controller;
- a switching converter including a first high-side (HS) transistor, a second HS transistor, a first low-side (LS) transistor and a second LS transistor;
- and
- a circuit configured to:
- generate a first signal that indicates a voltage at a node between the first HS transistor and the first LS transistor falling below ground;
- delay a gate-source voltage of the second LS transistor to generate a second signal;
- and
- merge the first signal and the second signal to generate a third signal,
- wherein the controller is configured to use the third signal to trigger a rising edge of a command signal to turn on the first LS transistor at a specific time, wherein the first LS transistor being turned on at the specific time reduces a diode conduction time of a body diode of the first LS transistor.
A semiconductor device comprising:
- a comparator configured to generate a first signal that indicates a voltage at a node between a first high-side (HS) transistor and a first low-side (LS) transistor in a switching converter falling below ground;
- a delay circuit configured to delay a gate-source voltage of a second LS transistor in the switching converter to generate a second signal;
- and
- an OR gate configured to:
- merge the first signal and the second signal to generate a third signal;
- and
- send the third signal to a controller to trigger a rising edge of a command signal to turn on the first LS transistor at a specific time, wherein the first LS transistor being turned on at the specific time reduces a diode conduction time of a body diode of the first LS transistor.
A method for operating a wireless power transfer device, the method comprising:
- generating a first signal that indicates a voltage at a node between a first high-side (HS) transistor and a first low-side (LS) transistor in a switching converter falling below ground;
- delaying a gate-source voltage of a second LS transistor in the switching converter to generate a second signal;
- merging the first signal and the second signal to generate a third signal;
- and
- using the third signal to trigger a rising edge of a command signal to turn on the first LS transistor at a specific time, wherein the first LS transistor being turned on at the specific time reduces a diode conduction time of a body diode of the first LS transistor.
Dependencies are inferred from the claim text.